Question

In order to estimate the average time high school students are currently spending on social media,...

In order to estimate the average time high school students are currently spending on social media, data were collected from a sample of 81 students over a one-week period. Based on prior studies, the population standard deviation can be assumed to be 1.2 hours.

If the sample mean is 9 hours, then the 95% confidence interval is approximately _____.

Select one:

a. 8.74 to 9.26 hours

b. 7.04 to 110.96 hours

c. 7.36 to 10.64 hours

d. 7.80 to 10.20 hours

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Solution :

Given that,

Sample size = n = 81

Z/2 = 1.96

Margin of error = E = Z/2* ( /n)

= 1.96 * (1.2 / 81)

Margin of error = E = 0.26

At 95% confidence interval estimate of the population mean is,

- E < < + E

9 - 0.26 < < 9 + 0.26

8.74 < < 9.26

8.74 to 9.26 hours

option a. is correct

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In order to estimate the average time high school students are currently spending on social media,...
In order to estimate the average time high school students are currently spending on social media, data were collected from a sample of 81 students over a one-week period. Based on prior studies, the population standard deviation can be assumed to be 1.2 hours. With a .95 probability, what is the margin of error (approximately)? Select one: a. .26 b. 1.64 c. .21 d. 1.96
In order to estimate the average time spent on the computer terminals per student at a...
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours. With a 0.95 probability, the margin of error is approximately 0.26 1.96 0.21 1.64
One researcher claims the national average time spent on social media is 4 hours per week....
One researcher claims the national average time spent on social media is 4 hours per week. A random sample of 404 individuals showed a sample of 4.2 hours per week. If national standard deviation is known to be 1.8, test if the true national average is greater than the researcher’s claim when α=.05.
A high school principal was concerned about the time his students were spending too much on...
A high school principal was concerned about the time his students were spending too much on internet in a week He randomly selected 50 students and found that mean time on internet was home work was 52.58 hours. Assume that the population standard deviation was 10.2 hrs. Use alpha:=0.10α = 0.10 to test his claims that his students spend significantly more than 50 hours in a week. In this case, null hypothesis H0 is In this case, Test statistics TS...
7. A high school principal is interested in the amount of time her students spend per...
7. A high school principal is interested in the amount of time her students spend per week working at an after school job. 37 students are randomly selected and their working hours are recorded. The sample had a mean of 12.3 hours and a standard deviation of 11.2 hours. We would like to construct an 80% confidence interval for the population mean hours worked weekly by high school students. a. What critical value will you use for an 80% confidence...
In order to estimate the average time spent on the computer lab terminals per student at...
In order to estimate the average time spent on the computer lab terminals per student at a local university, data were collected for a sample of 98 students over a one-week period. Assume the population standard deviation is 1.8 hours. If the sample mean is 9, then the lower limit for a 90% confidence interval is (Round your answer to three decimal places.)
1. The average number of minutes spent per day using social media by a population of...
1. The average number of minutes spent per day using social media by a population of college sophomores is 29.6 minutes. If we take a random sample of size n = 87 from this population and find that the sample standard deviation is 7.3 minutes, we know the sampling distribution of the sample mean in this case would have a standard deviation equal to A. 4.05 minutes. B. 1.60 minutes. C. 0.78 minutes. D. 7.30 minutes. E. 3.17minutes. 2. Return...
A study was conducted in order to estimate μ, the mean number of weekly hours that...
A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours. A similar study conducted a year earlier estimated that μ, the mean number of weekly hours that U.S. adults use computers at home,...
The Student Government Association is interested in an estimate of the mean number of hours students...
The Student Government Association is interested in an estimate of the mean number of hours students work per week. They take a simple random sample of 89 students. The data they collected can be found in the column labeled “Number of hours worked per week”. Use the sample data to construct a 95% confidence interval for the mean number of hours worked. Write one or two sentences to communicate to the Student Government Association the estimate and the margin of...
Case stydy - customers Businesses of all sizes are finding Facebook, Twitter, and other social media...
Case stydy - customers Businesses of all sizes are finding Facebook, Twitter, and other social media to be powerful tools for engaging customers, amplifying product messages, discovering trends and influencers, building brand awareness, and taking action on customer requests and recommendations. Half of all Twitter users recommend products in their tweets. About 1.6 billion people use Facebook, and more than 30 million businesses have active brand pages, enabling users to interact with the brand through blogs, comment pages, contests, and...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT